Portable toilet



FIG. 1 is a front, top, and left side perspective view of a portable toilet, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a use state perspective view thereof; and,

FIG. 9 is a contraction state perspective view thereof.

The broken lines shown in the drawings illustrate portions of the portable toilet that form no part of the claimed design. 

CLAIM The ornamental design for a portable toilet, as shown and described. 